Chair



2 SheetsSheet 1.

(No Model.)

S. HAYWARD.

CHAIR.

No. 374,250. Patented Dec. 6, 1887.

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S. HAYWARD.

CHAIR.

- ..,,,,//////////////.auuuiiiiinwn UNITED STATES PATENT OFFICE.

SAMUEL HAYWARD, OF BOSTON, MASSACHUSETTS.

CHAIR.

I SPECIFICATION farming part of Letters Patent No. 374,250, datedDecember 6, 1887.

Application tiled August 27, 1887. Serial No. 248,038. (No model.)

To aZZ whom it may concern:

Be it known that I, SAMUEL HAYWARD, of Boston, in the county of Suffolkand State of Massachusetts, have invented certain new and usefulImprovements in Chairs, of which the following, taken in connection withthe accompanying drawings, is a specification.

My invention relates to that class of chairs which have provision forvarying the inclination of the back and the height of the seat, and isan improvement upon the invention shown and described in the LettersPatent No. 363,389, granted to me May 24, 1887; and it consists incertain novel features of construction, arrangement, and combination ofparts, which will be readily understood by reference to the descriptionof the drawings and to the claims to be hereinafter given, and in whichmy invention is particularly pointed out.

Figure 1 of the drawings is a central verticalsection ofa chairembodying my invention,

7 the cutting plane being parallel, or nearly so,

to the side arms of the chair, the parts being in position to maintainthe seat at its highest elevation and the back in its most nearlyupright position. Fig. 2 is a vertical section of a portion of thechair, the cutting plane being through the center of one of the sideframes and parallel to the plane of section of Fig. 1. Fig. 3 is a planof the turn-table by means of which the chair is supported upon thecentral column and may be swiveled about the same, and Fig. 4 is adetail illustrating the manner of constructing and hanging the pivotedrear leg or truck-carrying lever.

In the drawings, A A are the side frames, provided with the arms B andconnected together by the tie-girts a, b, c, and (Z. G is the seat, andDthe back. Beneath the seat 0 is the gear-wheel E, mounted upon apendent stud set in the metal tie E and having teeth upon the under sideof its rim to engage with the teeth of the pinion F, by which it isrotated, and provided with teeth upon its periphery to engage with theteeth ofthe pinions 6 c, secured upon the screwsff, mounted in bearingsin the tie E and the castings G, fitted to slots in the lower portionsof the side frames, A A, all of the foregoing, except the last-mentionedcastings, being constructed, arranged, and operating substantially thesame as described in the before-cited Letters Patent.

The lower edges of the side frames, A A, are

slotted nearly their entire lengths from front to rear to receive thecastings G, which are firmly secured in position in said slotted framesby screws or otherwise, and have pivoted to their front ends the tableor platform H, composed of a circular center having four projectingarms, 9 g and h h, and two side plates or bars, z a, each connecting anarm, 9, with an arm, h, andprojecting to the rearward of arm h, andhaving formed upon the upper edge of said rearward projection aninclined cam-snrface, j, all cast in one piece.

The table or platform H is provided with the trunnions orjournals it it,(see Fig. 3,) by which it is pivoted to the front ends of the castingsG, and with the down wardly-projecting annular lip Z, to inclose theupper end of the central pedestal, I, upon which said ta ble or platformrests, and about which it may be revolved, if desired, or to which itmay be secured against revolution by means of a bolt, (shown in dottedlines in Fig. 1,) said platform being secured against accidental displacement by means of the spindle J, firmly secured in said platform andextending downwardly therefrom through the bearing J, formed in thepedestal I, a pin, m, being inserted through said spindle below saidbearing to prevent its withdrawal therefrom, all as shown in Fig. 1.

The rear ends of the castings G are bifurcated, and have fitted in andpivoted to said forked ends the metal levers n, the upper ends of whichare connected by the links 0 and 0, respectively, to thelcver ends ofthe side bars of the pivoted back D and to the non-revolving nuts 9,fitted to the screws ff, and movable vertically by the revolution ofsaidscrews, all as shown in Fig. 2.

The levers an project below their pivotal connections with the castingG, and are connected by the rod q, upon which is mounted near saidlevers the anti-friction trucks 1 r,

which rest upon the cam-surfaces 3', along which they roll as thenuts 1) are raised or depressed, to change the angle of the levers a nand,through them, the angles of the back and seat of the chair. I

The rear portions of the side frames, A A, are slotted to receive thelower end of the side bars of the back D, the upper ends of the levers nn, the links 0 and o, the nuts 1), and the screws ff, the forwardvertical end of said slots having secured therein the metal plates 8,against which the forward sides of. the nutsp bear for the purpose ofrelieving the lateral pressure upon the screws ff, as shown in Fig. 2.

The lower arms of the levers n n are extended below the trucks To", andhave their lower ends adapted to receive a caster-truck, t, said armbeing of such a length that thecasterwheel will touch or nearly touchthe floor when the back and seat are tilted to their greatestinclination, as shown in Fig. 2, thus broadening the base at the timewhen the greatest stability is required.

The lower arms of the levers n n, which are thus made at certain timesto serve as rear legs to the chair, are covered with a casing of wood,to, of the same kind as the body of the chair-frame, and may be carvedto any desired design. By this construction of the chair-leg I amenabled to make a very strong adjustable leg that shall be massive inappearance and comparatively light, and by fitting it to the forked endof the casting G, I obviate the danger of cramping the leg by theswelling or shrinking of the wooden side frame.

In another application of even date, Serial No. 248,039, herewith, acentral pedestal and a table or platform are shown of substantially thesame construction as those shown in the present application; but in thatcase the platform was pivoted at its front side to the lower arms of apair of pivoted and vibratory levers, so that as the screws wererevolved the whole chair-seat was raised or lowered, the rear portion,however, being moved a greater distance than the front portion, while inthis case the platform is pivoted directly to the chair-frame at itsfront side, and when the screws are revolved the rear of the seat israised or lowered without changing the height of the front of the seat.

The pedestal 1 is provided at its upper end with an upwardly-projectingannular lip, 11, having an exterior diameter somewhat less than theinterior diameter of the annular lipZ on the under side of the table orplatform H, so that when the said table or platform is placed inposition on said pedestal an annular chamber will be formed betweenthem, in which may be placed a series of anti-friction rolling supportsin the form of balls, as shown at w, or rolls, as shown at win Fig. 1.

I have shown and described anti-friction revoluble trucks as thepreferred means of supporting the rear levers n it upon thecam-surfacesj; but said trucks might be fixed upon their bearings so asto be non-revoluble and slide along said cam-surfaces with fairly goodresults and without affecting the principles of my invention, andtherefore I do not wish to be limited in my claims to the use ofrevolving trucks for such supports.

The operation of my invention will be readily understood from theforegoing without further description here.

-What I claim as new, and desire to secure by Letters Patent of theUnited States, 1s

1. The combination, in a chair, of apivoted back, twoindependently-pivoted levers, a pair of revoluble screws each carrying anon-revoluble nut, links connecting the upper ends of said levers withsaid nuts and with the p voted back, a table or platform pivoted at itsfront side to the side frames of the chair and provided withrearwardly-projecting plates having inclined cam-surfaces, and a pair oflaterally-projecting bearing-surfaces carried by the lower armsof saidlevers, and arranged and adapted to rest upon and move along saidcam-surfaces as said screws are revolved to raise or lower the rear edgeof the seat and vary the inclination of the back.

2. The combination, in a chair, of apivoted back, twoindependently-pivoted levers, apair of revoluble screws, a pair ofnon-revoluble nuts fitted to and movable by said screws, suitable linksconnecting the upper ends of sand levers with said nuts and back, atable or platform pivoted at its front side to the side frames of thechair and provided with rearwardlyprojecting plates having inclinedcam-surfaces, a pair of laterally-projecting bearing-surfaces carried bythe lower arms of said levers, and arranged and adapted to rest upon andmove along said cam-surfaces as said screws are revolved toraise orlower the rear edge of the seat and vary the inclination of the back,and a central pedestal or support fitted to said table or platform by aswivel-connection.

3. The combination, in a chair, of a pivoted back,twoindependently-pivotedlevers, a pair of revoluble screws, a pair ofnon-revoluble nuts fitted to said screws, links connecting the upper endof said levers with said nuts and back, a table or platform pivoted atits front side to the side frames of the chair and provfded withrearwardly-projecting plates having inclined canrsurfaces, a pair oflaterallyprojecting bearing-surfaces carried by the lower arms of saidlevers, and arranged to rest upon and move along said cam-surfaces toraise or lower the rear edge of the chair-seat, a central pedestalfitted to a circular bearing in the under side of said table orplatform, and aseries of revolving anti-friction supports interposedbetween said table or platform and pedestal, substantially as described.

4. The combination, in a chair, of a pivoted back, twoindependently-pivoted levers, apair of revoluble screws, a pair ofpinions secured one upon each of said screws, a spur gearwheel forrevolving said pinions and screws, apinion engaging said spur-gear andprovided with means for revolving the same, a pair of non-revoluble nutsfitted to said screws, links connecting the upper ends of said levers tosaid nuts and back, a table or platform pivoted at its front side to theside frames of the chair and provided with rearwardly-projecting plateshaving inclined cam-surfaces, and a pair of laterally-projectingbearing-surfaces carried by said levers, and arranged to rest upon andmove along said cam-surfaces as the screws are revolved to raise orlower the rear edge of the chair-seat.

5. In a chair having pivoted legs or supportinglevers, the combinationof slotted side frames of wood, a forked metal bar secured in said slotand extending from front to rear of said frame, and a leg or leverpivoted in the fork of said metal bar, the body of which is made ofmetal and the lower or outer arm of which is incased in wood,substantially as described.

In testimony whereof Ihave signed my name to this specification, in thepresence of two subscribing witnesses, on this 23d day of August, A. D.1887.

SAMUEL HAYWVARD.

Witnesses:

'N. G. LOMBARD,

\VALTER E. LOMBARD.

